[CentOS-virt] libvirt, xen PV, qemu-system-i386, root user

[Karel Hendrych]

...

changing from: <driver name='file'/> to: <driver name='tap2'/> makes the 
domain start without QEMU.

However I see much better performance with QEMU (close to dom0, tested 
using simple dd writes) than with tap2 driver. Is that expected?

What's best practise to file based storage on latest CentOS6-xen (Kernel 
3.18.17, Xen 4.4.2-7)

Are there any guides around running QEMU on CentOS6-xen as non-root user?

Cheers
--
Karel

On 7.9.2015 17:42, Karel Hendrych wrote:
> Hi, spot on!
>
>
> On 6.9.2015 12:56, Pasi Kärkkäinen wrote:
>> On Sun, Sep 06, 2015 at 09:08:50AM +0200, Karel Hendrych wrote:
>>> Hi, after migrating to libvirt/libxl according to:
>>>
>>
>> Hi,
>>
>>> https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt
>>>
>>> I've noticed that my Xen PV domains are being launched by
>>> qemu-system-i386 running under root privileges.
>>>
>>> I am wondering why is this? Previously no qemu process was used.
>>>
>>> If qemu is needed for some reason, are there any guidelines for
>>> non-root operation?
>>>
>>
>> In general qemu is used for the following purposes:
>>
>> - for certain domU disk backend types (image files), and/or if there's
>> no blktap driver in dom0 kernel.
>> - domU graphical console (PVFB) VNC server, if it's enabled for the domU.
>>
>>
>>> --
>>> Karel Hendrych
>>
>>
>> -- Pasi
>>
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